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Plusminus - what is it?

There are several web sites that explain plus/minus.

This one is among the best explanation - http://statsheet.com/blog/statgeek-101-understanding-plus-minus
 
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StatGeek 101: Understanding Plus/Minus 
February 09, 2011 ShareThis 
 
by StatGeek Robot
An important factor when evaluating a player is determining how well he fits with the team and the chemistry he has with his teammates on the court. While stats such as points, assists, and rebounds can tell you how a player performs as an individual, plus/minus tells you how the team plays when he is on the court.
Plus/minus can be used by coaches and evaluators to determine how the team performs as a whole when a particular player is in the game, compared to when he is sitting out. A team full of players with a strong plus/minus ratio = victories.
On-court Plus/Minus
Formula:
    •    Point Differential When Player Is On Court
On-court plus/minus is the point differential when a particular player is on the court or how much better (or worse) a team plays with a particular player on the court. For example, if Player A is on the court and his team is winning 24-18 when he steps off of the court, Player A’s on-court +/- would be +6. Conversely, if Player B was on the opposing team and he played the same amount of time as Player A, his on-court +/- would be -6.
On-court plus/minus shows who had a real impact on the team's performance during the game. This metric does a good job of identifying the “glue guys” on a particular team within the box score. The guys who do things that don’t impress with individual statistics, but are important to a teams success. If a player only scores a few points and grabs a few rebounds, but has a positive on-court +/-, it is likely he is contributing in other ways.
Off-court Plus/Minus Ratio
Formula:
    •    Point Differential When Player Is Off the Court
Off-court plus/minus is the point differential when a particular player is on the court or how much better (or worse) a team plays with a particular player off of the court. Unlike the on-court plus/minus, a positive off-court plus/minus number is not a good thing for the player being evaluated. For example, if Player A steps off of the court with the game tied at 20-20 and then comes back on the court with his team trailing 30-24, his off-court +/- would be -6, meaning his team was six points worse when he was off of the court. Conversely, if Player B played during the same time frame as Player A, his off-court +/- would be +6, meaning his team was six points better when he was off of the court.
Off-court +/- is an important stat for evaluating the leading scorer on a team with a poor record. If this player’s off-court +/- is in the positive range, then his play is affecting the play of those around him.
Roland Rating
Formula:
ONPM - OFFPM
Where:
    •    ONPM = On-Court Plus/Minus
    •    OFFPM = Off-Court Plus/Minus
The on-court +/- number represents a teams net points with the player on the floor, while the off-court number is a teams net points with the player off the floor. The Roland Rating is the difference between the two, with a positive number indicating the team has played better with the player than without. These ratings are important because they represent a player's value to a particular team.
This rating isn't an absolute measure of a player's ability, but it does represent how successful a player is for a given team. In general the player with the best Roland Rating on a team is the difference maker (excluding guys who play a statistically insignificant number of minutes). When the top guy is on the floor the team performs at a much higher level.
 

 

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